Chemistry · NDA previous year questions

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2017 35 questions

Q662017 · 10 Sept 2017
Electron emission from a metallic surface by application of light is known as
1. A.Thermionic emission
2. B.Photoelectric emission
3. C.High field emission
4. D.Autoelectronic emission
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Answer: B
Q712017 · 10 Sept 2017
The majority charge carriers in a p-type semiconductor are
1. A.free electrons
2. B.conduction electrons
3. C.ions
4. D.holes
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Answer: D
Q722017 · 10 Sept 2017
Which one of the following is a cause of acid rains?
1. A.Ozone
2. B.Ammonia
3. C.Sulphur dioxide
4. D.Carbon monoxide
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Answer: C
Q732017 · 10 Sept 2017
The desirable range of pH for drinking water is
1. A.6·5 to 8·5
2. B.5·0 to 6·5
3. C.6·5 to 7·0
4. D.7·0 to 8·5
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Answer: A
Q742017 · 10 Sept 2017
Consider the following reaction : $CH_{4} + 2 O_{2} \to CO_{2} + 2 H_{2} O$ Which of the following about the reaction given above is/are correct? 1. Carbon is oxidized. 2. Hydrogen is oxidized. 3. Hydrogen is reduced. 4. Carbon is reduced. Select the correct answer using the code given below :
1. A.1 only
2. B.1 and 2 only
3. C.2 and 3 only
4. D.2 and 4 only
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Answer: A
Q762017 · 10 Sept 2017
How much $CO_{2}$ is produced on heating of $1 kg$ of carbon?
1. A. $\frac{11}{3} kg$
2. B. $\frac{3}{11} kg$
3. C. $\frac{4}{3} kg$
4. D. $\frac{3}{4} kg$
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Answer: A
Q772017 · 10 Sept 2017
Zinc is used to protect iron from corrosion because zinc is
1. A.more electropositive than iron
2. B.cheaper than iron
3. C.a bluish white metal
4. D.a good conductor of heat and electricity
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Answer: A
Q782017 · 10 Sept 2017
Which one of the following gases is placed second in respect of abundance in the Earth’s atmosphere?
1. A.Oxygen
2. B.Hydrogen
3. C.Nitrogen
4. D.Carbon dioxide
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Answer: A
Q792017 · 10 Sept 2017
Which one of the following is a chemical change?
1. A.Cutting of hair
2. B.Graying of hair naturally
3. C.Swelling of resin in water
4. D.Cutting of fruit
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Answer: B
Q802017 · 10 Sept 2017
Which one among the following chemicals is used as washing soda?
1. A.Calcium carbonate
2. B.Calcium bicarbonate
3. C.Sodium carbonate
4. D.Sodium bicarbonate
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Answer: C
Q832017 · 10 Sept 2017
The species that has the same number of electrons as $_{17}^{35} Cl$ is
1. A. $_{16}^{32} S$
2. B. $_{16}^{34} S^{+}$
3. C. $_{18}^{40} Ar^{+}$
4. D. $_{16}^{35} S^{2 -}$
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Answer: C
Q842017 · 10 Sept 2017
The compound $C_{6} H_{12} O_{4}$ contains
1. A.22 atoms per mole
2. B.twice the mass percent of H as compared to the mass percent of C
3. C.six times the mass percent of C as compared to the mass percent of H
4. D.thrice the mass percent of H as compared to the mass percent of O
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Answer: C
Q852017 · 10 Sept 2017
The ionization energy of hydrogen atom in the ground state is
1. A.13.6 MeV
2. B.13.6 eV
3. C.13.6 Joule
4. D.Zero
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Answer: B
Q872017 · 10 Sept 2017
Which compound, when dissolved in water, conducts electricity and forms a basic solution?
1. A. $HCl$
2. B. $C H_{3} COOH$
3. C. $C H_{3} OH$
4. D. $NaOH$
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Answer: D
Q902017 · 10 Sept 2017
Which one of the following microbes causes acidification and curding of milk?
1. A.Lactic Acid Bacillus
2. B.Clostridium botulinum
3. C.Vibrio cholerae
4. D.Saccharomyces cerevisiae
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Answer: A
Q912017 · 10 Sept 2017
Who among the following shared the Nobel Prize in 1962 along with Francis Crick and James Watson for their discoveries concerning the molecular structure of nucleic acids?
1. A.Erwin Chargaff
2. B.Maurice Hugh Frederick Wilkins
3. C.Rosalind Franklin
4. D.Phoebus Levene
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Answer: B
Q952017 · 10 Sept 2017
Intake of which one of the following food components should be minimized by patients having Gouty Arthritis due to elevated serum uric acid level?
1. A.Food fibres
2. B.Nucleic acids
3. C.Lipids
4. D.Carbohydrates
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Answer: B
Q992017 · 10 Sept 2017
The proposition ‘equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure’ is known as
1. A.Avogadro’s hypothesis
2. B.Gay-Lussac’s hypothesis
3. C.Planck’s hypothesis
4. D.Kirchhoff’s theory
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Answer: A
Q642017 · 23 Apr 2017
Which one of the following statements is correct with regard to the material of electrical insulators?
1. A.They contain no electrons
2. B.Electrons do not flow easily through them
3. C.They are crystals
4. D.They have more number of electrons than the protons on their surface
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Answer: B
Q712017 · 23 Apr 2017
A positive charge $+ q$ is placed at the centre of a hollow metallic sphere of inner radius $a$ and outer radius $b$ . The electric field at a distance $r$ from the centre is denoted by $E$ . In this regard, which one of the following statements is correct?
1. A. $E = 0$ for $a < r < b$
2. B. $E = 0$ for $r < a$
3. C. $E = q /4 π ε_{0} r$ for $a < r < b$
4. D. $E = q /4 π ε_{0} a$ for $r < a$
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Answer: A
Q722017 · 23 Apr 2017
Molecules of which of the following has cage like structure ? 1. Diamond 2. Graphite 3. Fullerenes Select the correct answer using the code given below :
1. A.1, 2 and 3
2. B.2 and 3 only
3. C.2 only
4. D.3 only
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Answer: D
Q732017 · 23 Apr 2017
Temporary hardness in water is due to which one of the following of Calcium and Magnesium ?
1. A.Hydrogencarbonates
2. B.Carbonates
3. C.Chlorides
4. D.Sulphates
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Answer: A
Q742017 · 23 Apr 2017
Which one of the following elements is least reactive with water ?
1. A.Lithium
2. B.Sodium
3. C.Potassium
4. D.Cesium
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Answer: A
Q752017 · 23 Apr 2017
Rutherford's alpha-particle scattering experiment was responsible for the discovery of
1. A.Electron
2. B.Proton
3. C.Nucleus
4. D.Helium
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Answer: C
Q772017 · 23 Apr 2017
Which one of the following statements is NOT correct ?
1. A.In the conduction mode of transference of heat, the molecules of solid pass heat from one molecule to another without moving from their positions
2. B.The amount of heat required to raise the temperature of a substance is called its specific heat capacity
3. C.The process of heat transfer in liquids and gases is through convection mode
4. D.The process of heat transfer from a body at higher temperature to a body at lower temperature without heating the space between them is known as radiation
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Answer: B